Lifting-jack.



PATENTED NOV. 12, 1907.

W. M. COX. LIPTING JACK.

APPLICATION FILED JAN. 26, 1907.

2 SHEETS-BHBET l.

wilmeoocz No. 870,939. PATENTED NOV. 12, 1907. W. M. 00X.

LIFTING JACK.

APPLICATION FILED JAILZG, 1907 2 SHEBTS-SHEET 2.

FIE =3 WWVM WILLIAM MELVILLE COX, OF BELLEVILLE, ILLINOIS.

LIFTING-JACK.

Specification of Letters Patent.

Patented Nov. 12, 1907.

Applicationfiled January 26.1907. Serial No. 354,288.

To all whom it may concern:

Be it known that 1, WILLIAM MELVILLE Cox, a citizen of the United States, residing at Belleville, in the county of St. Clair and State of Illinois, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

My invention relates to an improvement in lifting jacks, and the object is to provide a simplified construction having powerful leverage, and with all, a lifting jack which is not likely to get out of order, and the parts of which may be easily replaced if any portion should break or wear out. 7

'With the foregoing object in vie w, my invention consists in certain novel features of construction and combinations of parts which will be hereinafter described and pointed out in the claims.

In the accompanying drawings z l igurcs 1 and 2 are views from opposite sides of the lifting jack. Fig. 3 is a vertically longitudinal sectional view. Fig. 4 is a transverse view. Fig. 5 is a detached view of the base showing the standard in horizontal section. Fig. 6 is a detail view of the connecting link which extends from one runner to another.

A, represents thebasc which may be variously constructed but is preferably cast substantially as shown in Fig. 5. i

B is the standard which is bolted in the socket 1 of the base where it is held rigidly in an upright position. A- handle 2 at the upper end is provided for lifting, carrying, and handling the jack.

Two runners C and D are mounted on the standard, runner G above D as indicated, the standard passing through orifices formed in the runners for that purpose. Runner C is provided with the usual rest 3 on its outer end adapted to take under the axle. Within this runner C is pivoted a locking jaw l by means of the pin or bolt 5 extending through the runner, the spring 6 normally forcing the locking jaw inward and holding the toothed gripping block '7 against the rear edge of the standard B whereby the runner is securely locked against downward movement when the parts are in their normal position. This clamping lever terminates at its rear end in a finger piece 8 which protrudes far enough beyond the runner to afford a hold or grip for the operator when he desires to lower the runner, this being accomplished by lifting upwardly on the finger piece against the action of the spring which has the result of disengaging the gripping block from the standard thereby releasing the runner therefrom and permitting it to slide downward on the stand ard.

The lower runner D is provided with a spring 9 which rests yieldingly upon the forward edge of the standard, its function being to insure the proper position of the runner as the jack is operated. The runner D is provided at its forward end with a stud 10 which has a laterally projecting lug 11 on its outer end, and this stud is adapted to enter the key hole aperture 12 in the connecting link 13 which connects the lower runner D with a stud 14 on the hand lever shank 15, which latter hand lever shank is pivotally connected to the upper runner C by means of a bolt 16, so that the connecting link virtually connects the two runners. The depending flange 17 on the upper runner forms a guard for housing the upper end of the connecting link and retaining it on its stud.

The purpose of the key-hole aperture is to provide for disconnecting the parts whichmay be done by removing the bolt 16 and the hand lever shank, whereupon the connecting link is disconnected from the latter, and by giving it a quarter turn it may be disconnected from the stud on the lower runner D. In reverse fashion, the parts are assembled. The upper runner C and the upper end of the standard, preferably the shank of the handle, are provided with grips 18 and 19 for stretching wire.

In the operation of my improved lifting jack, the jack is first placed with the rest beneath the axle to be raised, the hand lever being brought to a vertical position, after which it is lowered approximately to a horizontal position, which has the effect of raising the upper runner C. With the return of the lever to vertical position, the lower runner is raised to a position where it engages the lug 20 depending from the upper runner, the latter remaining stationary when the hand lever is raised. The operation is repeated until the axle is raised to the required position, the runners alternately moving up and down, one at a time, the up per runner as the hand lever descends and the lower runner as it ascends, first one runner clutching the standard and then the other. Then, to lower the runners as previously explained,.the clamping lever is lifted, and the parts are slid down the standard as far as the base, if desired.

It is evident that more or less slight changes might be resorted to in the form and arrangement of the several parts described, without departing from the spirit and scope of my invention, and hence I do not wish to limit myself to the exact construction herein set forth, butz- I Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:-

1. In a lifting jack, :1 standard, runners mounted thereon, a hand lever pivotally connected with one runner, a stud on the lower runner provided with a laterallylaterally-projecting lug adapted to enter the slot in the 10 projecting mg, and a liiili pivoted to the hand level, said lower end of the link. link having a keyhole slot for engaging the stud on the In testimony whereof I have signed my name to this lower runner. specification in the presence of two subscribing witnesses.

2. In a lifting jack, :1 standard, runners mounted thereon, a spring-actuated clamping device on the upper runner, a lever pivoted to the said runner a connecting Witnesses: link pivoted to the lever and provided with a keyhol'e slot F. A. WOODLAND, at its lower end, and a stud on the lower runner having a I F. L. Kmuvs.

W-ILL IAM MELVILLE COX. 

